Tin mines were dotted around Devon and Cornwall in England. There are plans to re-open the South Crofty mine in Cornwall.
For sure there would have been Devon and Cornish newspapers in the 1800's.
The Exeter Flying Post and Cornish Advertiser are listed here:
http://www.jisc.ac.uk/media/documents/programmes/digitisation/jisc_19cnewspaper_map_04.pdf
.